Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 329, Issue 2, Pages L29-L33Publisher
BLACKWELL PUBLISHING LTD
DOI: 10.1046/j.1365-8711.2002.05093.x
Keywords
stars : activity; circumstellar matter; stars : pre-main-sequence; stars : rotation; open clusters and associations : individual : eta Chamaeleontis
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A limited-area survey of the eta Chamaeleontis cluster has identified two new late-type members. The more significant of these is ECHA J0843.3-7905 (=IRAS F08450-7854), a slowly rotating (P = 12 d) M2 classical T Tauri (CTT) star with a spectrum dominated by Balmer emission. At a distance of 97 pc and cluster age of approximate to9 Myr, the star is a nearby rare example of an 'old' CTT star and promises to be a rewarding laboratory for the study of disc structure and evolution in pre-main sequence (PMS) stars. The other new member is the M4 weak-lined T Tauri (WTT) star ECHA J0841.5-7853, which is the lowest mass (M approximate to 0.2 M.) primary known in the cluster.
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